Electronic apparatus and radio communication method in radio communication system

ABSTRACT

An electronic apparatus and radio communication method in a radio communication system. The electronic apparatus includes: one or more processing circuits configured to execute the following operations: determining, based on an antenna array corresponding to the electronic apparatus, corresponding a transceiver unit (TXRU) configuration, wherein each TXRU is associated with one set of antenna units having a same polarization direction, the antenna array includes plural antenna units having M rows, N columns and P-dimensional polarization directions, and M, N and P are natural numbers; and adding antenna configuration information to a radio resource control (RRC) signaling to be use in a user equipment (UE) in the radio communication system, wherein the antenna configuration information is used to obtain a number of the TXRU in the antenna configuration.

TECHNICAL FIELD

The present disclosure relates to the technical field of wirelesscommunication, and in particular to an electronic device in a wirelesscommunication system and a method for performing wireless communicationin a wireless communication system.

BACKGROUND

This section provides background information related to the presentdisclosure, which is not necessarily the conventional art.

With development of communication technology, research on verticalbeamforming/FD MIMO (Full-Dimension Multiple-Input Multiple-Output) inLTE (Long Term Evolution) is started. The difference between thevertical beamforming/FD MIMO and the conventional transmission systemlies in introducing a vertical dimension and using more antennas.

Moreover, with introduction of the vertical dimension, 2D antenna arrayis further proposed. Additionally, for convenience of description oflarge-scale antenna, a concept of TXRU (transceiver unit) is proposedcorrespondingly. TXRU is a radio transceiver unit with independent phaseand amplitude.

There are multiple combinations of antenna arrays in 3D MIMO system.Moreover, the number of the TXRUs is variable, and a same number of TXRUcorresponds different antenna configurations. Different antennaconfigurations result in different features of physical channels, inthis case, the base station should select different codebooks to reflectthe feature of the physical channels. In addition, different antennaconfigurations may affect a manner of transmitting a reference signal bya base station and a manner of a UE (User Equipment) measuring andfeeding back the feature of a wireless channel. Hence, in order toimprove transmission efficiency, it is necessary to notify the antennaconfiguration of the base station to the UE.

In a 3D MIMO system, an original notification unit for 1D antenna arrayinformation is no longer applicable since a 2D wireless array is used.

Hence, it is necessary to provide a new base-station-to-UE antennaconfiguration transmission design to serve for the 2D antenna array andthe 3D MIMO system.

SUMMARY

This section provides a general summary of the present disclosure,rather than a full disclosure of full scope or all features of thepresent disclosure.

It is an object of the present disclosure to provide an electronicdevice in a wireless communication system and a method for performingwireless communication in a wireless communication system, so that auser equipment can obtain an antenna configuration of a base station,thereby the user equipment can conform to the configuration of the basestation when estimating and measuring a channel, and transmissionperformance of the 3D MIMO system is improved.

According to an aspect of the present disclosure, an electronic devicein a wireless communication system is provided. The electronic deviceincludes one or more processing circuits configured to executeoperations of: determining a corresponding transceiver unit TXRUconfiguration based on an antenna array corresponding to the electronicdevice, where each TXRU is related to a group of antenna units having asame polarization direction, the antenna array includes multiple antennaunits which are in M rows and N columns and have a P-dimensionpolarization direction, where M, N and P are natural numbers; and addingantenna configuration information into a Radio Resource Control RRCsignaling for a user equipment in the wireless communication system,where the antenna configuration information is used to obtain the numberof TXRUs in the antenna array.

According to another aspect of the present disclosure, an electronicdevice in a wireless communication system is provided. The electronicdevice includes one or more processing circuits configured to execute anoperation of: extracting antenna configuration information from an RRCsignaling from a base station in the wireless communication system,where the antenna configuration information is used to obtain the numberof transceiver units TXRUs in an antenna array of the base station,where each TXRU is related to a group of antenna units having a samepolarization direction, the antenna array includes multiple antennaunits which are in M rows and N columns and have a P-dimensionpolarization direction, where M, N and P are natural numbers.

According to another aspect of the present disclosure, a method forperforming wireless communication in a wireless communication system isprovided. The method includes: determining a corresponding transceiverunit TXRU configuration based on an antenna array corresponding to anelectronic device in the wireless communication system, where each TXRUis related to a group of antenna units having a same polarizationdirection, the antenna array includes multiple antenna units which arein M rows and N columns and have a P-dimension polarization direction,where M, N and P are natural numbers; and adding antenna configurationinformation into a Radio Resource Control RRC signaling for a userequipment in the wireless communication system, where the antennaconfiguration information is used to obtain the number of TXRUs in theantenna array.

According to another aspect of the present disclosure, a method forperforming wireless communication in a wireless communication system isprovided. The method includes: extracting antenna configurationinformation from an RRC signaling from a base station in the wirelesscommunication system, where the antenna configuration information isused to obtain the number of transceiver units TXRUs in an antenna arrayof the base station, where each TXRU is related to a group of antennaunits having a same polarization direction, the antenna array includesmultiple antenna units which are in M rows and N columns and have aP-dimension polarization direction, where M, N and P are naturalnumbers.

With the electronic device in the wireless communication system and themethod for performing wireless communication in the wirelesscommunication system according to the present disclosure, the antennaconfiguration information may be transmitted via RRC signaling, and maybe used to obtain the number of TXRUs in the antenna array. Accordingly,a user equipment can obtain an antenna configuration of a base station,thereby the user equipment can conform to the configuration of the basestation when estimating and measuring a channel, and transmissionperformance of the 3D MIMO system is improved.

A further applicable scope will become apparent based on the descriptionprovided herein. The description and specific examples in the overvieware only for schematic purposes and are not intended to limit the scopeof the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings described herein are only for schematic purposes of theselected embodiments rather than all possible implementation, and arenot intended to limit the scope of the present disclosure. In thedrawings,

FIG. 1 is a schematic diagram illustrating an example of a relationshipbetween a TXRU and an antenna;

FIG. 2 is a schematic diagram illustrating another example of arelationship between a TXRU and an antenna;

FIG. 3 is a schematic diagram illustrating 2D cross polarization antennaarray;

FIG. 4 is a block diagram illustrating a structure of an electronicdevice in a wireless communication system according to an embodiment ofthe present disclosure;

FIG. 5 is a schematic diagram illustrating an example of TXRUconfiguration in an antenna array;

FIG. 6 is a schematic diagram illustrating another example of TXRUconfiguration in an antenna array;

FIG. 7 is a block diagram illustrating a structure of an electronicdevice in a wireless communication system according to an embodiment ofthe present disclosure;

FIG. 8 is a sequence diagram illustrating a method for performingwireless communication in a wireless communication system according toan embodiment of the present disclosure;

FIG. 9 is a schematic diagram illustrating an example of 8CSI-RS(channel state information reference signal) arranged in 2 rows and 4columns;

FIG. 10 is a block diagram illustrating a first example of a schematicconfiguration of an eNB (evolution Node Base Station) to which thepresent disclosure is applicable;

FIG. 11 is a block diagram illustrating a second example of a schematicconfiguration of an eNB to which the present disclosure is applicable;

FIG. 12 is a block diagram illustrating an example of a schematicconfiguration of a smartphone to which the present disclosure isapplicable; and

FIG. 13 is a block diagram illustrating an example of a schematicconfiguration of a car navigation device to which the present disclosureis applicable.

While the present disclosure is susceptible to various modifications andalternative forms, specific embodiments thereof have been shown by wayof example in the drawings and are herein described in detail. It shouldbe understood, however, that the description herein of specificembodiments is not intended to limit the present disclosure to theparticular forms disclosed, but on the contrary, the intention of thepresent disclosure is to cover all modifications, equivalents, andalternatives falling within the spirit and scope of the presentdisclosure. Note that corresponding reference numerals indicatecorresponding parts throughout the several views of the drawings.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Examples of the present disclosure will now be described more fully withreference to the accompanying drawings. The following description ismerely exemplary in nature and is not intended to limit the presentdisclosure, application, or uses.

Example embodiments are provided so that this disclosure will bethorough, and will fully convey the scope to those skilled in the art.Numerous specific details are set forth such as examples of specificcomponents, devices, and methods, to provide a thorough understanding ofembodiments of the present disclosure. It will be apparent to thoseskilled in the art that specific details need not be employed, thatexample embodiments may be implemented in many different forms and thatneither should be construed to limit the scope of the disclosure. Insome example embodiments, well-known processes, well-known structures,and well-known technologies are not described in detail.

The UE (User Equipment) according to the present disclosure includes butnot limited to a terminal having a wireless communication function suchas a mobile terminal, a computer, a vehicle equipment and the like.Further, the UE according to the present disclosure may further be UEitself or a component therein such as a chip. In addition, the basestation according to the present disclosure may be, for example, eNB(evolution Node Base Station) or a component in the eNB such as thechip.

TXRU (transceiver unit) is a radio transceiver unit with an independentphase and amplitude. FIG. 1 and FIG. 2 illustrate two examples of arelationship between a TXRU and an antenna. In FIG. 1 and FIG. 2, q is aTx signal vector at M same polarization antenna units in one column, wand W are wideband TXRU virtual weight vector and matrix respectively, xis TXRU signal vector at M_(TXRU) TXRUs. The parameter M_(TXRU)indicates the number of TXRUs in each dimension of a polarizationdirection of each column in the antenna array.

In 2D antenna array, the number of antennas may be represented by (M, N,P), where M is the number of antennas having a same polarizationdirection in each column, N is the number of columns of the antennaarray, and P is the number of dimension of antenna polarizationdirection. FIG. 3 illustrates cross-polarized 2D antenna array. As shownin FIG. 3, the antenna array includes multiple antenna units which arein M rows and N columns and have a two-dimension polarization direction.In the antenna unit as shown in FIG. 3, one polarization direction isrepresented by a solid line, and another polarization direction isrepresented by a dotted line.

In conjunction with a conception of TXRU, the number of antennas (M, N,P) may be converted into the number of TXRUs (M_(TXRU), N, P). A valueof M_(TXRU) is agreed on in the field of wireless communicationtechnology currently. Further, setting of TXRU is also agreed on in thefield of wireless communication technology currently, as shown in Table1.

TABLE 1 antenna configuration structure N = 1 N = 2 N = 4 M = 8 4TXRU(1D)  8TXRU (1D/2D) 8TXRU (2D) 16TXRU (2D) 32TXRU (2D) 64TXRU (2D) M = 4 8TXRU (1D/2D) 16TXRU (2D) 32TXRU (2D)

As can be seen from Table 1 that, there are multiple combinations ofantenna arrays in 3D MIMO (3-Dimension Multiple-Input Multiple-Output)system. Moreover, the number of TXRUs may be changed from 4 to 64, andsame number of TXRUs corresponds to different antenna configurations.Different antenna configurations result in different features ofphysical channels, in this case, the base station should selectdifferent codebooks to reflect the feature of the physical channels. Inaddition, different antenna configurations may affect a manner oftransmitting a reference signal by a base station and a manner of a UEmeasuring and feeding back the feature of a wireless channel. Hence, inorder to improve transmission efficiency, it is necessary to notify theantenna configuration of the base station to the UE. Hence, thedisclosure proposes a new base-station-to-UE antenna configurationtransmission design to serve for 2D antenna array and 3D MIMO system.

FIG. 4 illustrates a structure of an electronic device 400 in a wirelesscommunication system according to an embodiment of the presentdisclosure. As shown in FIG. 4, the electronic device 400 may include aprocessing circuit 410. It is to be noted that, the electronic device400 may either include one processing circuit 410 or multiple processingcircuits 410. Additionally, the electronic device 400 may furtherinclude an antenna array 420, a communication unit 430 and the like.

The processing circuit 410 may be configured to execute the operationof: determining a corresponding TXRU configuration based on an antennaarray 420 corresponding to the electronic device 400. As mentionedabove, each TXRU is related to a group of antenna units having a samepolarization direction, the antenna array includes multiple antennaunits which are in M rows and N columns and have a P-dimensionpolarization direction, where M, N and P are natural numbers.

It may be realized by those skilled in the art that, the processingcircuit 410 may include various discrete functional units to perform avariety of different functions and/or operations. It is to be noted thatthese functional units may be physical entities or logical entities, anddifferent units may be implemented by the same physical entity.

For example, the processing circuit 410 may include a determination unit(not shown in the drawings) which can determine a corresponding TXRUconfiguration based on the antenna array 420.

Further, processing circuit 410 may be configured to execute theoperation of: adding antenna configuration information into a RRC (RadioResource Control) signaling for a UE in the wireless communicationsystem, where the antenna configuration information is used to obtainthe number of the TXRUs in the antenna array 420. Correspondingly, theprocessing circuit 410 may include an adding unit (not shown in thedrawings) for adding the antenna configuration information into the RRCsignaling.

With the electronic device 400 according to an embodiment of the presentdisclosure, the antenna configuration information may be transmitted viathe RRC signaling and used to obtain the number of the TXRUs in theantenna array 420. Since notification is performed via the RRCsignaling, broadcast resource may be saved, and a UE supporting TXRUtransmission is notified and unnecessary analysis of the conventional UEis reduced. Accordingly, effective transmission of TXRU configurationinformation is implemented.

FIG. 5 illustrates an example of TXRU configuration in an antenna array.As shown in FIG. 5, in antenna array configuration (8, 4, 2, 16), theantenna array includes multiple antenna units which are in 8 rows and 4columns and have a two-dimension polarization direction, and includes 16TXRUs. It is to be noted that, since same polarization directions ineach dashed box belong to same TXRU and the antenna array has atwo-dimension polarization direction, each dashed box corresponds to twoTXRUs. Similarly, in antenna array configuration (8, 4, 2, 32), theantenna array includes multiple antenna units which are in 8 rows and 4columns and have a two-dimension polarization direction, and includes 32TXRUs. In antenna array configuration (8, 4, 2, 64), the antenna arrayincludes multiple antenna units which are in 8 rows and 4 columns andhave a two-dimension polarization direction, and includes 64 TXRUs.

As can be seen from FIG. 5, in 2D antenna array, the antenna arrays mayhave different numbers of TXRUs although antenna array configuration (M,N, P) are the same. Hence, effective transmission of TXRU configurationinformation is necessary.

According to a preferred embodiment of the present disclosure, theantenna configuration information may be used to obtain at leastinformation on a parameter M_(TXRU) to indicate the number of TXRUs ineach dimension of a polarization direction of each column in the antennaarray 420. In other words, the parameter M_(TXRU) refers to the numberof TXRUs in each dimension of a polarization direction of each column inthe antenna array 420.

FIG. 6 illustrates another example of TXRU configuration in an antennaarray. As shown in FIG. 6, in antenna array configuration (8, 4, 2, 2),the antenna array includes multiple antenna units which are in 8 rowsand 4 columns and have a two-dimension polarization direction, and thenumber of TXRUs in each dimension of a polarization direction of eachcolumn in the antenna array is 2. It is to be noted that, since samepolarization directions in each dashed box belong to same TXRU and theantenna array has a two-dimension polarization direction, each dashedbox corresponds to two TXRUs. Similarly, in antenna array configuration(8, 4, 2, 4), the antenna array includes multiple antenna units whichare in 8 rows and 4 columns and have a two-dimension polarizationdirection, and the number of TXRUs in each dimension of a polarizationdirection of each column in the antenna array is 4. In antenna arrayconfiguration (8, 4, 2, 8), the antenna array includes multiple antennaunits which are in 8 rows and 4 columns and have a two-dimensionpolarization direction, and the number of TXRUs in each dimension of apolarization direction of each column in the antenna array is 8.

It is to be noted that, indications of the parameters M_(TXRU), M, N andP of antenna array configuration may have various sequences so long asthe sequence is uniform in advance on both sending and receiving end. Asequence of the parameters in an example of FIG. 6 is (M, N, P,M_(TXRU)), and a parameter sequence (M_(TXRU), M, N, P) is taken as anexample in subsequent description.

According to a preferred embodiment of the present disclosure, anumerical range of the parameter M_(TXRU) may at least include 1, 2, 4and 8 and a value of the parameter M_(TXRU) is less than or equal to avalue of the parameter M. The numerical range of the parameter M_(TXRU)and a relationship between the numerical range of the parameter M_(TXRU)and the parameter M can be obtained based on the antenna configurationstructure in Table 1.

According to a preferred embodiment of the present disclosure, the RRCsignaling may contain information on the number of antenna ports usablefor a 3D MIMO (3-Dimension Multiple-Input Multiple-Output)/FD MIMO(Full-Dimension Multiple-Input Multiple-Output) system to indicate thenumber of the TXRUs. Since the number of TXRUs is the same as the numberof antenna ports, the information on the number of antenna ports may beused in the 3D MIMO/FD MIMO system to indicate the number of TXRUs in acase that the RRC signaling contains the information.

According to a preferred embodiment of the present disclosure, theantenna configuration information may explicitly or implicitly containinformation on an antenna configuration parameter. Next, firstly, it isdescribed in detail the case that the antenna configuration informationexplicitly contains information on an antenna configuration parameter.

It is known for the inventor that, as a part of radio resource controlinformation, an antenna notification information unit (antennainfoinformation elements) is defined in the RRC information unit. A processand a structure of the antenna notification information unit are asfollows.

-- ASN1START AntennaInfoCommon ::= SEQUENCE { antennaPortsCountENUMERATED {an1, an2, an4, spare1} } AntennaInfoDedicated ::= SEQUENCE {transmissionMode ENUMERATED { tm1, tm2, tm3, tm4, tm5, tm6, tm7,tm8-v1320}, codebookSubsetRestriction CHOICE { n2TxAntenna-tm3 BITSTRING (SIZE (2)), n4TxAntenna-tm3 BIT STRING (SIZE (4)),n2TxAntenna-tm4 BIT STRING (SIZE (6)), n4TxAntenna-tm4 BIT STRING (SIZE(64)), n2TxAntenna-tm5 BIT STRING (SIZE (4)), n4TxAntenna-tm5 BIT STRING(SIZE (16)), n2TxAntenna-tm6 BIT STRING (SIZE (4)), n4TxAntenna-tm6 BITSTRING (SIZE (16)) } OPTIONAL, -- Cond TM ue-TransmitAntennaSelectionCHOICE{ release NULL, setup ENUMERATED {closedLoop, openLoop} } }AntennaInfoDedicated-v1320 ::= SEQUENCE {codebookSubsetRestriction-v1320 CHOICE { n2TxAntenna-tm8-r9 BIT STRING(SIZE (6)), n4TxAntenna-tm8-r9 BIT STRING (SIZE (32)) } OPTIONAL -- CondTM8 } AntennaInfoDedicated-r10 ::= SEQUENCE { transmissionMode-r10ENUMERATED { tm1, tm2, tm3, tm4, tm5, tm6, tm7, tm8-v1320, tm9-v1020,tm10-v1130, spare6, spare5, spare4, spare3, spare2, spare1},codebookSubsetRestriction-r10 BIT STRING OPTIONAL,-- Cond TMXue-TransmitAntennaSelection CHOICE{ release NULL, setup ENUMERATED{closedLoop, openLoop} } } AntennaInfoDedicated-v12xx ::= SEQUENCE {alternativeCodebookEnabledFor4TX-r12 ENUMERATED {true} OPTIONAL--CondTMY } -- ASN1STOP

It can be seen that, in above antenna notification information unit,contents being notified to a UE include the number of antenna ports, atransmission mode and a corresponding codebook subset restriction. Theantenna notification information should be transmitted to the UE in aprocess that the UE performs random access since the antennanotification information unit is a part of radio resource control (RRC)information unit. The UE transmits RRC connection request signaling to abase station on a random access channel to establish RRC connection inthe process that the UE performs random access. Then the base stationtransmits RRC connection establishment signaling to the UE on a forwardaccess channel including the antenna notification information unit.Additionally, the codebook subset restriction may also be transmitted inCSI-Process information unit. In this case, the codebook subsetrestriction may still be transmitted in CSI process information unit.Moreover, in order to keep integrity of current antenna notificationinformation unit, it is hoped that only antenna communicationinformation is added without changing existing information unit.

According to a preferred embodiment of the present disclosure, theantenna configuration parameter in the antenna configuration informationmay include one or more of: the parameter M_(TXRU), a parameter M, aparameter N, a parameter P and a combination thereof. Preferably, theantenna configuration parameter may include the parameter M_(TXRU), theparameter M, the parameter N and the parameter P.

Additionally, according to a preferred embodiment of the presentdisclosure, the processing circuit 410 (for example, the adding unitincluded in the processing circuit 410) may add the antennaconfiguration information into an antenna notification information unitor a CSI-RS (channel state information reference signal) configurationinformation unit in the RRC signaling.

Specifically, for example, a unit called antennaNumberCount may be addedinto AntennaInfoDedicated-r13. The unit contains four parameters(M_(TXRU), M, N, P). To meet antenna configuration in Table 1, M may beequal to 4 or 8, N may be equal to 1, 2 or 4, P may be equal to 1 or 2,and a corresponding M_(TXRU) may be obtained form Table 1. Since thepart is new-added content, the unit should occur after conventionalcontent, the changed antenna notification information unit is asfollows.

...... AntennaInfoDedicated-r13 ::= SEQUENCE { antennaNumberCountMENUMERATED {an4,an8} antennaNumberCountN ENUMERATED {an1,an2,an4}antennaNumberCountP ENUMERATED {an1,an2} antennaNumberConutMTXRUENUMERATED {TXRU1,TXRU2,TXRU4,TXRU8} }

An actual value of the antenna configuration parameter or a function ofthe actual value may be represented by a predetermined bit number whenthe base station notifies the parameters to the UE. For example, theantenna parameters are indicated by 1 bit or 2 bits, or the actualvalues of the antenna parameters are transmitted. Further, the basestation may also transmit the parameters in form of log₂ (M_(TXRU), M,N, P) since the antenna parameters are in form of exponential of 2.

Moreover, for the parameter sequence (M_(TXRU), M, N, P), the basestation may use a parameter M/M_(TXRU) to replace the parameter M_(TXRU)or M. In this case, the parameter may be transmitted separately in acase that the parameter M/M_(TXRU) is constant in a system, therebysystem overhead is reduced. Moreover, in a case that the number ofantennas in a TXRU is constant, the UE can obtain the total number ofantennas in the system based on the number of TXRUs, thus only twoparameters are required to be transmitted in the parameter sequence (M,N, P).

Another method for obtaining the number of TXRUs is defining a new partcalled CSI-RS-Config-r13 in CSI-RS-Config information unit, and the partincludes antennaPortsCount-r13. The number of TXRUs can be obtained fromthe new part since the number of TXRUs is equal to the number of antennaports. The changed CSI-RS-Config information unit is as follows.

CSI-RS-Config-r10 ::= SEQUENCE { ...... CSI-RS-Config2-r12 ::= SEQUENCE{ ...... CSI-RS-Config-r13 ::= SEQUENCE { csi-RS-r13 CHOICH {  releaseNULL,  setup  SEQUENCE { antennaPortsCount-r13 ENUMERATED {an4, an8,an16, an32, an64, spare3, spare2, spare1}, ...... } }zeroTxPowerCSI-RS-r13 CHOICH{ ...... }

The user can obtain the number of the TXRUs based onantennaPortsCount-r13. Accordingly, in the scheme, the parametersequence (M_(TXRU), M, N, P) may be simplified into (M, N, P), and theantenna parameter may be obtained after knowing the number of the TXRUs.Moreover, the parameter sequence (M, N, P) may also be explicitlytransmitted in CSI-RS-Config-r13.

Next, it is described in detail the case that the antenna configurationinformation implicitly contains information on an antenna configurationparameter.

According to a preferred embodiment of the present disclosure, theprocessing circuit 410 (for example, the adding unit included in theprocessing unit 410) may add the antenna configuration information byusing a codebook subset restriction in the RRC signaling. Morepreferably, the processing circuit 410 (for example, the adding unitincluded in the processing unit 410) may express the antennaconfiguration information by adding a predetermined bit number into abit string for selecting a codebook in the codebook subset restriction.Alternatively, the processing circuit 410 (for example, the adding unitincluded in the processing unit 410) may express the antennaconfiguration information by adding a codebook index into the codebooksubset restriction.

Specifically, a new transmission mode is provided in the presentdisclosure and different antenna configurations are distinguished basedon the codebook subset restriction. Firstly, it is provided a newtransmission mode for vertical beamforming/FD MIMO system. The newtransmission mode defines a codebook subset restriction includinginformation on the number of the antennas and the number of the TXRUs.In the conventional antenna notification information unit, it can beseen that, in codebookSubsetRestriction part, transmission conditionsare distinguished based on the number of the antenna ports. Hence, inthe new transmission mode, the transmission conditions can still bedistinguished based on the number of the antenna ports. It can be saidthat the transmission conditions are distinguished based on the numberof the TXRUs since the number of the antenna ports is equal to thenumber of the TXRUs. As can be seen from Table 1, the number of theTXRUs may be equal to 4, 8, 16, 32 or 64. Moreover, different antennaconfiguration states under the same number of TXRUs can be distinguishedby adding several bits into a bit string for selecting a codebook. Thechanged antenna information transmission unit is as follows.

AntennaInfoDedicated-r10 ::= SEQUENCE { transmissionMode-r10 ENUMERATED{ tm1, tm2, tm3, tm4, tm5, tm6, tm7, tm8-v1320, tm9-v1020, tm10-v1130,tm11-v13xx, spare5, spare4, spare3, spare2, spare1},codebookSubsetRestriction-r10 BIT STRING OPTIONAL, -- Cond TMXue-TransmitAntennaSelection CHOICE{ release NULL, setup ENUMERATED{closedLoop, openLoop} } } ...... AntennaInfoDedicated-v13xx ::=SEQUENCE { codebookSubsetRestriction-v13xx CHOICE { n4TxAntenna-tm11-r13BIT STRING (SIZE (96)), n8TxAntenna-tm11-r13 BIT STRING (SIZE (112)),n16TxAntenna-tm11-r13  BIT STRING (SIZE (219)), n32TxAntenna-tm11-r13 BIT STRING (SIZE (437)), n64TxAntenna-tm11-r13  BIT STRING (SIZE(872)), } OPTIONAL }

Several bits are added to front of the bit string to distinguishdifferent antenna configurations since the same number of the TXRUs maycorrespond to different antenna configurations in Table 1. The UE shouldextract the added bit based on the number of the antenna ports anddetermine antenna configuration upon reception of the bit string. It isassumed that a length of a bit string is 96 in a case of 4 antennaports. Moreover, in Table 1, the number of the added bits is 0 sincethere is only one antenna configuration in a case of 4 TXRUs. It isassumed that a length of a bit string is 109 in a case of 8 antennaports. The number of the added bits is 3 since there are 5 antennaconfigurations for 8 TXRUs in Table 1. For cases of 16, 32 and 64antenna ports, it is assumed that patterns of organization of bitmapping tables under these three cases are similar to a case of 8antenna ports, only a scale of the bit mapping table is bigger. It canbe seen from Table 1 that, the number of the added bits are 1, 1 and 0for 16, 32 and 64 antenna ports respectively. Hence, the lengths of bitstring corresponding to three cases should be 219, 437 and 872. Arelationship between the added bits and the antenna configuration is asshown in Table 2.

TABLE 2 correspondence between the added bit and antenna configurationantenna added bit string configuration  4 TXRU — (8, 2, 1)  8 TXRU 000(8, 2, 2) 001 (8, 4, 1) 010 (8, 4, 2) 011 (4, 4, 1) 100 (4, 4, 2) 16TXRU 0 (8, 4, 2) 1 (4, 4, 2) 32 TXRU 0 (8, 4, 2) 1 (4, 4, 2) 64 TXRU —(8, 4, 2)

Another method for designing codebook subset restriction is firstlydesigning a codebook index for distinguishing antenna configurations,then selecting a corresponding code from a bit mapping table of thecodebook subset restriction. The changed antenna notificationinformation unit is as follows.

AntennaInfoDedicated-r10 ::= SEQUENCE { transmissionMode-r10 ENUMERATED{ tm1, tm2, tm3, tm4, tm5, tm6 tm7, tm8-v1320, tm9-v1020, tm10-v1130,tm11-v13xx, spare5, spare4,spare3, spare2, spare1},codebookSubsetRestriction-r10 BIT STRING OPTIONAL, -- Cond TMXue-TransmitAntennaSelection CHOICE{ release NULL, setup ENUMERATED{closedLoop, openLoop} } } ...... AntennaInfoDedicated-v13xx ::=SEQUENCE {  codebookSelectionIndex ENUMERATED{index1, index2, index3,index4, index5, index6, spare2, spare1}, codebookSubsetRestriction-v13xxCHOICE { n4TxAntenna-tm11-r13  BIT STRING (SIZE (96)),n8TxAntenna-tm11-r13  BIT STRING (SIZE (109)), n16TxAntenna-tm11-r13 BITSTRING (SIZE (218)), n32TxAntenna-tm11-r13 BIT STRING (SIZE (436)),n64TxAntenna-tm11-r13 BIT STRING (SIZE (872)), } OPTIONAL }

In the design, the codebook subset restriction is used to select coderather than distinguishing antenna configurations, hence, the part ofadding bit in previous design is no longer needed. In Table 1, there are6 types of different antenna configurations regardless of the number ofTXRUs, hence, there are 6 indexes in codebook selection. Acorrespondence between the codebook selection index and the antennaconfiguration is as shown in Table 3.

TABLE 3 correspondence between codebook selection index and antennaconfiguration codebook selection antenna index configuration 000 (8,2, 1) 001 (8, 2, 2) 010 (8, 4, 1) 011 (8, 4, 2) 100 (4, 4, 1) 101 (4, 4,2)

As described above, selection of antenna configuration and CSI-RStransmission mechanism are different in two schemes. In a first scheme,the parameter sequence (M_(TXRU), M, N, P) can be obtained directly, theantenna configuration is (M, N, P). Moreover, a total number of theTXRUs is known as (M_(TXRU)×N×P) based on the parameters M_(TXRU) and N,hence, the number of CSI-RSs is (M_(TXRU)×N×P). The CSI-RSs aredistributed in M_(TXRU) rows and N columns and a P-dimensionpolarization direction. However, in a second scheme, the number of theTXRUs may be obtained based on the codebook subset restriction. Theantenna configuration may be obtained from Table 2 or Table 3. Thenumber of CSI-RSs N_(CSI-RS) (that is equal to the number of the TXRUs)and distribution of CSI-RSs may be determined based on the total numberof the TXRUs and the antenna configuration (M, N, P). FIG. 9 is anexample of 8CSI-RS distributed in 2 rows and 4 columns, which is usedfor 2D antenna array with the antenna parameters (1, 8, 4, 2), (2, 8, 4,1), (1, 4, 4, 2) and (2, 4, 4, 1).

It is to be noted that, according to an embodiment of the presentdisclosure, the wireless communication system as described above may bea LTE-A (Long Term Evolution-Advanced) cellular communication system,the electronic device 400 may be a base station in the wirelesscommunication system, and the electronic device 400 may further includean antenna array 420, a communication unit 430 and the like. Forexample, the communication unit 430 may transmit RRC signaling to a UEin the wireless communication system.

The electronic device on a base-station side in the wirelesscommunication system is described as above. Next, an electronic deviceon a UE side in the wireless communication system is described indetail. FIG. 7 illustrates a structure of an electronic device 700 in awireless communication system according to an embodiment of the presentdisclosure.

As shown in FIG. 7, the electronic device 700 may include a processingcircuit 710. It is to be noted that, the electronic device 700 mayeither include one processing circuit 710 or multiple processingcircuits 710. Additionally, the electronic device 700 may furtherinclude a communication unit 720 and the like.

The processing circuit 710 may extract antenna configuration informationfrom an RRC signaling from a base station in the wireless communicationsystem.

As mentioned above, similarly, the processing circuit 710 may alsoinclude various discrete functional units to perform a variety ofdifferent functions and/or operations. These functional units may bephysical entities or logical entities, and different units may beimplemented by the same physical entity.

For example, the processing circuit 710 may include an extraction unit(not shown in the drawings) which may extract antenna configurationinformation from an RRC signaling from a base station in the wirelesscommunication system.

As mentioned above, the antenna configuration information may be used toobtain the number of TXRUs in an antenna array of the base station.Similarly, each TXRU is related to a group of antenna units having asame polarization direction, the antenna array includes multiple antennaunits which are in M rows and N columns and have a P-dimensionpolarization direction, where M, N and P are natural numbers.

Preferably, the antenna configuration information may be used to obtainat least information on a parameter M_(TXRU) to indicate the number ofTXRUs in each dimension of a polarization direction of each column inthe antenna array.

Preferably, a numerical range of the parameter M_(TXRU) at leastincludes 1, 2, 4 and 8 and a value of the parameter M_(TXRU) is lessthan or equal to a value of a parameter M.

Preferably, the processing circuit 710 (for example, an extraction unitincluded in the processing circuit 710) may further extract, from theRRC signaling, information on the number of antenna ports usable for a3D MIMO/FD MIMO system to determine the number of the TXRUs.

Preferably, the antenna configuration parameter may include theparameter M_(TXRU), a parameter M, a parameter N and a parameter P.

Preferably, the processing circuit 710 may decode at least one of anantenna notification information unit, a CSI-RS configurationinformation unit and a codebook subset restriction information unit inthe RRC signaling to obtain the antenna configuration information.Correspondingly, the processing circuit 710 may include a parsing unit(not shown in the drawings) which can execute the preceding parsingoperation.

Preferably, the processing circuit 710 may select at least one of a CSI(channel state information) feedback codebook and a CSI feedback schemebased on the antenna configuration information. More preferably, theprocessing circuit 710 may select both of a CSI feedback codebook and aCSI feedback based on the antenna configuration information.Correspondingly, the processing circuit 710 may include a selection unit(not shown in the drawings) which can execute the preceding selectionoperation.

It is to be noted that, according to an embodiment of the presentdisclosure, the wireless communication system as described above may bea LTE-A cellular communication system, the electronic device 700 may bea UE in the wireless communication system, and the electronic device 700may further include a receiver (for example, the communication unit 720)to receive the RRC signaling.

The electronic device in the wireless communication system according toan embodiment of the present disclosure is described as above. Next, amethod for performing wireless communication in a wireless communicationsystem according to an embodiment of the present disclosure is describedin detail.

The method for performing wireless communication in a wirelesscommunication system according to an embodiment of the presentdisclosure may include: determining a corresponding TXRU configurationbased on an antenna array corresponding to an electronic device in thewireless communication system, where each TXRU is related to a group ofantenna units having a same polarization direction, the antenna arrayincludes multiple antenna units which are in M rows and N columns andhave a P-dimension polarization direction, where M, N and P are naturalnumbers.

The method may further include adding antenna configuration informationinto a RRC signaling for a user equipment in the wireless communicationsystem, where the antenna configuration information is used to obtainthe number of TXRUs in the antenna array.

Preferably, the antenna configuration information may be used to obtainat least information on a parameter M_(TXRU) to indicate the number ofTXRUs in each dimension of a polarization direction of each column inthe antenna array.

Preferably, a numerical range of the parameter M_(TXRU) at leastincludes 1, 2, 4 and 8 and a value of the parameter M_(TXRU) is lessthan or equal to a value of a parameter M.

Preferably, the RRC signaling may contain information on the number ofantenna ports usable for a 3D MIMO/FD MIMO system to indicate the numberof the TXRUs.

Preferably, the antenna configuration information may explicitly containinformation on an antenna configuration parameter.

Preferably, the antenna configuration parameter may include one or moreof: the parameter M_(TXRU), a parameter M, a parameter N, a parameter Pand a combination thereof. More preferably, the antenna configurationparameter may include the parameter M_(TXRU), the parameter M, theparameter N and the parameter P.

Preferably, the antenna configuration information may be added into anantenna notification information unit or a CSI-RS configurationinformation unit in the RRC signaling.

Preferably, an actual value of the antenna configuration parameter or afunction of the actual value may be represented by a predetermined bitnumber.

Preferably, the antenna configuration information may implicitly containinformation on an antenna configuration parameter.

Preferably, the antenna configuration information may be added by usinga codebook subset restriction in the RRC signaling.

Preferably, the antenna configuration information may be expressed byadding a predetermined bit number into a bit string for selecting acodebook in the codebook subset restriction.

Preferably, the antenna configuration information may be expressed byadding a codebook index into the codebook subset restriction.

In another aspect, a method for performing wireless communication in awireless communication system according to an embodiment of the presentdisclosure may include: extracting antenna configuration informationfrom an RRC signaling from a base station in the wireless communicationsystem.

As mentioned above, the antenna configuration information may be used toobtain the number of transceiver units TXRUs in an antenna array of thebase station, where each TXRU is related to a group of antenna unitshaving a same polarization direction, the antenna array includesmultiple antenna units which are in M rows and N columns and have aP-dimension polarization direction, where M, N and P are naturalnumbers.

Preferably, the antenna configuration information may be used to obtainat least information on a parameter M_(TXRU) to indicate the number ofTXRUs in each dimension of a polarization direction of each column inthe antenna array.

Preferably, a numerical range of the parameter M_(TXRU) at leastincludes 1, 2, 4 and 8 and a value of the parameter M_(TXRU) is lessthan or equal to a value of a parameter M.

Preferably, information on the number of antenna ports usable for a 3DMIMO/FD MIMO system may further be extracted from the RRC signaling, todetermine the number of the TXRUs.

Preferably, the antenna configuration parameter may include theparameter M_(TXRU), a parameter M, a parameter N and a parameter P.

Preferably, at least one of an antenna notification information unit, aCSI-RS configuration information unit and a codebook subset restrictioninformation unit in the RRC signaling may be decoded to obtain theantenna configuration information.

Preferably, at least one of a CSI feedback codebook and a CSI feedbackscheme may be selected based on the antenna configuration information.More preferably, both a CSI feedback codebook and a CSI feedback may beselected based on the antenna configuration information.

Various specific embodiments of the above steps of a method forperforming wireless communication in a wireless communication system isdescribed in detail as above, which is not described here.

Next, a signal interaction process between a base-station side and auser side in a wireless communication system according to an embodimentof the present disclosure is described in detail in conjunction withFIG. 8.

FIG. 8 is a sequence diagram of a method for performing wirelesscommunication in a wireless communication system according to anembodiment of the present disclosure.

As show in FIG. 8, in step S101, the user transmits an RRC connectionrequest signaling to a base station to establish RRC connection.

In step S102, the base station transmits an RRC connection establishmentsignaling to the user, which includes an antenna notificationinformation unit and a codebook subset restriction. The base station mayselect a first scheme or a second scheme to transmit the antennaconfiguration information during transmission. In the first scheme, theparameter sequence (M_(TXRU), M, N, P) is transmitted explicitly. In thesecond scheme, the parameter sequence (M_(TXRU), M, N, P) may beobtained based on the codebook subset restriction and the added bit or acodebook selection index.

In step S103, the user determines CSI feedback scheme and a codebookbased on the antenna configuration information. The CSI feedback schemeshould be applicable to M_(TXRU)×P×N CSI feedbacks.

In step S104, the user transmits an RRC connection establishmentcomplete signaling to the base station.

In step S105, the base station transmits CSI-RS to the user.

In step S106, the user estimates the channel and calculates CSI feedbackinformation based on the CSI feedback scheme and the codebook. Thenumber of CSI-RSs should be M_(TXRU)×P×N and the user can calculatecorresponding CSI feedback information.

In step S107, the user transmits the CSI feedback information to thebase station.

In step S108, the base station obtains the channel feedback and performsradio resource management and pre-encoding.

Finally, in step S109, steps S105 to S108 are repeated. A process fromtransmitting the CSI-RS signaling to the base station performing radioresource management and pre-encoding may be performed periodically.

Next, an operation mode of the present disclosure is described inconjunction with an example in which the base-station antennaconfigurations are (1, 8, 4, 2) and (2, 4, 4, 1) and the base stationtransmits 8 CSI-RS by using 8 antenna ports in FIG. 9.

In a case of the antenna configuration being (1, 8, 4, 2), it is assumedthat the antenna configuration is transmitted explicitly by using thefirst scheme. In AntennaInfoDedicated-r13, values corresponding to theantenna configuration parameters should be as follows:antennaNumberCountM=8, antennaNumberCountN=4, antennaNumberCountP=2,antennaNumberCountMTXRU=1. The base station transmits the parametervalues to the user so that the user can obtain that the antennaconfiguration of the base station is (1, 8, 4, 2), and the signalingsare as follows.

...... AntennaInfoDedicated-r13 ::= SEQUENCE { antennaNumberCountM  8antennaNumberCountN  4 antennaNumberCountP 2 antennaNumberConutMTXRU  1}

Similarly, signaling being transmitted by the base station are asfollows in a case that the antenna configuration is (2, 4, 4, 1).

...... AntennaInfoDedicated-r13 ::= SEQUENCE { antennaNumberCountM  4antennaNumberCountN  4 antennaNumberCountP 1 antennaNumberConutMTXRU  2}

Alternatively, the base station selects the second scheme to transmitthe antenna configuration implicitly. The base station should select totransmit n8TXAntenna-tm11-r13 in codebooksubsetrestriction-v13xx sincethe number of the antenna ports of the base station is 8. Since theantenna configuration parameter is (8, 4, 2), based on Table 2, in acase of 8TXRU, the added bits should be 010 (or a codebook selectionindex is used, and in this case the index should be 011). Accordingly,the user can determine that the antenna parameter configuration is (8,4, 2) based on the information. And the user has obtained that thenumber of the TXRUs of the base station is 8, and the user can know thatan overall antenna configuration of the base station is (1, 8, 4, 2).The signaling are as follows.

AntennaInfoDedicated-r10 ::= SEQUENCE { transmissionMode-r10 ENUMERATED{ tm1, tm2, tm3, tm4, tm5, tm6, tm7, tm8-v1320, tm9-v1020, tm10-v1130,tm11-v13xx, spare5, spare4, spare3, spare2, spare1},codebookSubsetRestriction-r10 BIT STRING OPTIONAL,-- Cond TMXue-TransmitAntennaSelection CHOICE{ release NULL, setup ENUMERATED{closedLoop, openLoop} } } ...... AntennaInfoDedicated-v13xx ::=SEQUENCE { codebookSubsetRestriction-v13xx CHOICE { n8TxAntenna-tm11-r13BIT STRING (SIZE (112)), } OPTIONAL }

Similarly, the added bits should be 011 (or a codebook selection indexis used, and in this case the index should be 110) in a case that theantenna configuration is (2, 4, 4, 1), the signaling being transmittedby the base station are as follows.

AntennaInfoDedicated-r10 ::= SEQUENCE { transmissionMode-r10 ENUMERATED{ tm1, tm2, tm3, tm4, tm5, tm6, tm7, tm8-v1320, tm9-v1020, tm10-v1130,tm11-v13xx, spare5, spare4, spare3, spare2, spare1},codebookSubsetRestriction-r10 BIT STRING OPTIONAL,-- Cond TMXue-TransmitAntennaSelection CHOICE{ release NULL, setup ENUMERATED{closedLoop, openLoop} } } ...... AntennaInfoDedicated-v13xx ::=SEQUENCE { codebookSubsetRestriction-v13xx CHOICE { n8TxAntenna-tm11-r13BIT STRING (SIZE (112)), } OPTIONAL }

The user selects a corresponding codebook to perform CSI feedback uponreception of such two antenna configurations of base station. In a casethat the antenna configuration on a base-station side is (1, 8, 4, 2),for example, the user equipment determines that there are 8 TXRUs in asame horizontal direction, which is the same as the assumed antennaconfiguration of current Rel-12, and the user equipment selects to use acodebook of 8 antenna ports in TM10, that iscodebook_((1,8,4,2))=codebook_(8-tm10)Correspondingly, the user equipment feeds back a code index beingselected from the codebook (for example, PMI) to the base station. In acase that the antenna configuration on the base-station side is (2, 4,4, 1), for example, the user equipment determines that there are twosets of TXRUs with different heights. Each set contains 4 TXRUscorresponding to 4 antenna ports, thus two sets of codebooks of 4antenna ports are selected. Further, since two sets of TXRUs have offsetphase due to height difference. The two sets of codebooks haverelevance, for example, the user equipment takes a codebook of 4 antennaports in TM 10 as a first set of codebook, and obtains a second set ofcodebook by adding oddest phase θ to a code in the codebook of 4 antennaports in TM10, that is

${codebook}_{({2,4,4,1})} = \begin{pmatrix}{codebook}_{4 - {{tm}\; 10}} \\{{codebook}_{4 - {{tm}\; 10}}e^{j\;\theta}}\end{pmatrix}$correspondingly, the user equipment feeds back the code index beingselected from the above codebook (for example, PMI) and the offset phaseto the base station.

As can be seen that, the user selects different CSI feedback codebooksbased on the antenna configuration on the base-station side in a casethat antenna configurations especially TXRU configurations on thebase-station side are different. Moreover, in the example, in a processof determining the CSI codebook feedback on a user side, the useractually uses two parameters of M_(TXRU) and the number of ports on thebase-station side. The base-station side only needs to transmit M_(TXRU)and N×P signaling without independent information on M, N and P.Moreover, the base station can allow the user to determine acorresponding antenna codebook only by transmitting one of M_(TXRU) andN×P since a total number of TXRUs on the base-station side can bedetermined based on the number of antenna ports. Hence, in practice, thebase station should transmit all or a part of the transmission parametersequence (M_(TXRU), M, N, P) to the user, and signaling overhead of thesystem can be reduced.

In practice, the user transmits an RRC connection request signaling tothe base station to establish RRC connection, and the base stationtransmits an RRC connection establishment signaling to the user, inwhich the base station can select the first scheme or the second schemeas above described to add related information on antenna configurationinto the RRC connection establishment signaling. The user determines ascheme and a codebook for CSI feedback based on the received antennaconfiguration information, then the user transmits an RRC connectionestablishment complete signaling to the base station. Thereafter, thebase station transmits CSI-RS as shown in FIG. 9 to the user in a casethat the base station needs to perform channel estimation. The userperforms channel measurement upon reception of the CSI-RS, thendetermines CSI feedback information based on the determined the schemeand the codebook for CSI feedback and transmits to the base station. Thebase station completes channel estimation after obtaining CSI feedback,and performs a corresponding radio resource management and pre-encoding.

According to an embodiment of the present disclosure, in a new design ofantenna configuration notification, the number of antennas and thenumber of the TXRUs on the base-station side are notified to the UE.Being inspired by the description of the number of antennas and thenumber of TXRUs in 2D antenna array, the parameter sequence (M_(TXRU),M, N, P) is enough to notify all antenna configurations to the UE.

According to an embodiment of the present disclosure, the antennaconfiguration information is transmitted from the base station to the UEby using change in the antenna notification information unit and otherrelated information unit, thereby optimizing CSI feedback mechanism inthe 3D MIMO system, and improving transmission performance of 3D MIMOsystem.

According to an embodiment of the present disclosure, a user in the 3DMIMO system can determine antenna configuration of the base station. Inthe 3D MIMO system, an original notification unit used for 1D antennaarray information is no longer applicable since a 2D antenna array isused. The antenna notification information unit is necessary in radioresource management. The two schemes according to the present disclosureare applicable to the antenna notification information unit in the 3DMIMO system.

According to an embodiment of the present disclosure, CSI feedback flowin the 3D MIMO system can be completed. Original CSI feedback flow isnot applicable to the 3D MIMO system since a new perpendicular dimensionis introduced into the 3D MIMO system. To implement CSI feedback flow inthe 3D MIMO system, the user needs to determine antenna configuration onthe base-station side, and an antenna notification mechanism designedaccording to the present disclosure can realize the objective, therebycompleting CSI feedback flow in the 3D MIMO system.

According to an embodiment of the present disclosure, the antennaconfiguration notification scheme according to the present disclosure isa necessary part of the 3D MIMO system, thereby perfecting the 3D MIMOsystem.

According to an embodiment of the present disclosure, the schemesinclude explicit and implicit modes, and a relationship between antennaconfiguration parameters to be indicated is taken into fullconsideration. Hence, the scheme according to the present disclosure hasbetter flexibility, low signaling overhead and small change in standard,and it is easy to extend to use the scheme according to the presentdisclosure in future different antenna number combinations.

The technology of the present disclosure can be applied to variousproducts. For example, the base station mentioned in the presentdisclosure may be implemented as any type of an evolved node B (eNB),such as a macro eNB and a small eNB. The small eNB may be an eNB whichcovers a cell smaller than a macro cell, such as a pico eNB, a micro eNBand a home (femto) eNB. Alternatively, the base station may beimplemented as any other type of a base station, such as a Node B and abase transceiver station (BTS). The base station may include: a mainbody (also referred to as a base station device) configured to controlthe wireless communication, and one or more remote radio header (RRH)provided at a different site from the main body. Further, various typesof terminals may be served as a base station by performing the functionof the base station temporarily or semi-permanently.

For example, the UE mentioned in the present disclosure may beimplemented as a mobile terminal (such as an smart phone, a panelpersonal computer (PC), a notebook PC, a portable game terminal, aportable/dongle mobile router and a digital camera device) or anon-board terminal (such as a car navigation device). The UE may also beimplemented as a terminal for performing machine to machine (M2M)communication, which is also referred to as a machine-type communication(MTC) terminal. Further, the UE may be a wireless communication modulemounted on each of the above terminals (such as the integrated circuitmodule including a single chip).

FIG. 10 is a block diagram illustrating a first example of a schematicconfiguration of an eNB to which the technology according to the presentdisclosure is applicable. An eNB 1000 includes one or more antennas 1010and a base station device 1020. The base station device 1020 and eachantenna 1010 may be connected with each other via RF cable.

Each of the antennas 1010 includes one or more antenna elements (such asthe multiple antenna elements included in the multiple-inputmultiple-output (MIMO) antenna), and is used for transmitting andreceiving the wireless signal by the base station device 1020. As showin FIG. 10, the eNB 1000 may include multiple antennas 1010. Forexample, the multiple antennas 1010 may be compatible with the multiplefrequency bands used by the eNB 1000. The eNB 1000 may also include asingle antenna 1010 although FIG. 10 shows an example of the eNB 1000including multiple antennas 1010.

The base station device 1020 includes a controller 1021, a memory 1022,a network interface 1023 and a wireless communication interface 1025.

For example, the controller 1021 may be a CPU or DSP, and performsvarious functions of higher layers of the base station device 1020. Forexample, the controller 1021 generates a data packet based on the datain the signal processed by the wireless communication interface 1025,and transfers the generated packet via the network interface 1023. Thecontroller 1021 may bundle data from multiple baseband processors togenerate bundled packet, and transfers the generated bundled packet. Thecontroller 1021 may have logical function to perform the control such asradio resource control, radio bearer control, mobility management,admission control and scheduling. The control may be performed inconjunction with the neighboring eNB or a core network node. The memory1022 includes RAM and ROM, and stores the program to be performed by thecontroller 1021 and various types of control data (such as a terminallist, transmission power data and scheduling data).

The network interface 1023 is a communication interface for connectingthe base station device 1020 to the core network 1024. The controller1021 may communication with the core network node or another eNB via thenetwork interface 1023. In this case, the eNB 1000 and the core networknode or other eNB may be connected with each other via a logic interface(such as Si interface and X2 interface). The network interface 1023 mayalso be a wired communication interface or a wireless communicationinterface for wireless backhaul routing. If the network interface 1023is a wireless communication interface, the network interface 1023 mayuse a higher frequency band for wireless communication as compared withthat used by the wireless communication interface 1025.

The wireless communication interface 1025 supports any cellularcommunication scheme (such as the long term evolution (LTE) and theLTE-Advanced), and provides a wireless connection to a terminal locatedin the cell of the eNB 1000 via the antenna 1010. The wirelesscommunication interface 1025 may generally include for example a baseband (BB) processor 1026 and a RF circuit 1027. The BB processor 1026may perform for example encoding/decoding, modulation/demodulation andmultiplexing/de-multiplexing, and performs various types of signalprocesses of the layer (for example L1, media access control (MAC),radio link control (RLC) and packet data convergence protocol (PDCP)).Instead of the controller 1021, the BB processor 1026 may have some orall of the above logical functions. The BB processor 1026 may be amemory storing the communication control program, or a module includinga processor and related circuit configured to perform the program. Theupdating program may change the function of the BB processor 1026. Themodule may be a card or blade inserted into the slot of the base stationdevice 1020. Alternatively, the module may be a chip mounted on the cardor the blade. The RF circuit 1027 may include for example a mixer, afilter and an amplifier, and transmit and receive the wireless signalvia the antenna 1010.

As shown in FIG. 10, the wireless communication interface 1025 mayinclude multiple BB processors 1026. For example, the multiple BBprocessors 1026 may be compatible with the multiple frequency bands usedby the eNB 1000. As shown in FIG. 10, the wireless communicationinterface 1025 may include multiple RF circuits 1027. For example, themultiple RF circuits 1027 may be compatible with multiple antennaelements. Although an example in which the wireless communicationinterface 1025 includes multiple BB processors 1026 and multiple RFcircuits 1027 is shown in FIG. 10, the wireless communication interface1025 may include a single BB processor 1026 and a single RF circuit1027.

FIG. 11 is a block diagram illustrating a second example of a schematicconfiguration of an eNB to which the technology according to thedisclosure is applicable. An eNB 1130 includes one or more antennas1140, a base station device 1150 and a RRH 1160. The RRH 1160 and eachantenna 1140 may be connected with each other via RF cable. The basestation device 1150 and the RRH 1160 may be connected with each othervia a high-speed line such as optical fiber.

Each of the antennas 1140 includes one or more antenna element (such asthe multiple antenna elements included in the MIMO antenna), and is usedfor transmitting and receiving the wireless signal by the RRH 1160. Asshow in FIG. 11, the eNB 1130 may include multiple antennas 1140. Forexample, the multiple antennas 1140 may be compatible with the multiplefrequency bands used by the eNB 1130. The eNB 1130 may also include asingle antenna 1140 although FIG. 11 shows an example of the eNB 1130including multiple antennas 1140.

The base station device 1150 includes a controller 1151, a memory 1152,a network interface 1153, a wireless communication interface 1155 and aconnection interface 1157. The controller 1151, the memory 1152 and thenetwork interface 1153 are the same as the controller 1021, the memory1022 and the network interface 1023 as described in FIG. 10.

The wireless communication interface 1155 supports any cellularcommunication scheme (such as LTE and LTE-Advanced), and provideswireless communication to a terminal positioned in a sectorcorresponding to the RRH 1160 via the RRH 1160 and the antenna 1140. Thewireless communication interface 1155 may typically include, forexample, a BB processor 1156. The BB processor 1156 is the same as theBB processor 1026 described with reference to FIG. 10, except that theBB processor 1156 is connected to the RF circuit 1164 of the RRH 1160via the connection interface 1157. The wireless communication interface1155 may include the multiple BB processors 1156, as illustrated in FIG.11. For example, the multiple BB processors 1156 may be compatible withmultiple frequency bands used by the eNB 1130. Although FIG. 11illustrates the example in which the wireless communication interface1155 includes the multiple BB processors 1156, the wirelesscommunication interface 1155 may also include a single BB processor1156.

The connection interface 1157 is an interface for connecting the basestation device 1150 (wireless communication interface 1155) to the RRH1160. The connection interface 1157 may also be a communication modulefor communication in the above-described high speed line that connectsthe base station device 1150 (wireless communication interface 1155) tothe RRH 1160.

The RRH 1160 includes a connection interface 1161 and a wirelesscommunication interface 1163.

The connection interface 1161 is an interface for connecting the RRH1160 (wireless communication interface 1163) to the base station device1150. The connection interface 1161 may also be a communication modulefor communication in the above-described high speed line.

The wireless communication interface 1163 transmits and receiveswireless signals via the antenna 1140. The wireless communicationinterface 1163 may typically include, for example, the RF circuit 1164.The RF circuit 1164 may include, for example, a mixer, a filter, and anamplifier, and transmits and receives wireless signals via the antenna1140. The wireless communication interface 1163 may include multiple RFcircuits 1164, as illustrated in FIG. 11. For example, the multiple RFcircuits 1164 may support multiple antenna elements. Although FIG. 11illustrates the example in which the wireless communication interface1163 includes the multiple RF circuits 1164, the wireless communicationinterface 1163 may also include a single RF circuit 1164.

In the eNB 1000 and the eNB 1130 illustrated in FIGS. 10 and 11, thecommunication unit 430 described by using FIG. 4 may be implemented bythe wireless communication interface 1025, and the wirelesscommunication interface 1155 and/or the wireless communication interface1163. At least a part of the functions may also be implemented by thecontroller 1021 and the controller 1151.

FIG. 12 is a block diagram illustrating an example of a schematicconfiguration of a smartphone 1200 to which the technology according tothe present disclosure is applicable. The smartphone 1200 includes aprocessor 1201, a memory 1202, a storage 1203, an external connectioninterface 1204, a camera 1206, a sensor 1207, a microphone 1208, aninput device 1209, a display device 1210, a speaker 1211, a wirelesscommunication interface 1212, one or more antenna switches 1215, one ormore antennas 1216, a bus 1217, a battery 1218, and an auxiliarycontroller 1219.

The processor 1201 may be, for example, a CPU or a system on a chip(SoC), and controls functions of an application layer and another layerof the smartphone 1200. The memory 1202 includes RAM and ROM, and storesa program that is executed by the processor 1201 and data. The storage1203 may include a storage medium such as a semiconductor memory and ahard disk. The external connection interface 1204 is an interface forconnecting an external device (such as a memory card and a universalserial bus (USB) device) to the smartphone 1200.

The camera 1206 includes an image sensor (such as a charge coupleddevice (CCD) and a complementary metal oxide semiconductor (CMOS)), andgenerates a captured image. The sensor 1207 may include a group ofsensors such as a measurement sensor, a gyro sensor, a geomagneticsensor, and an acceleration sensor. The microphone 1208 converts soundsthat are inputted to the smartphone 1200 to audio signals. The inputdevice 1209 includes, for example, a touch sensor configured to detecttouch on a screen of the display device 1210, a keypad, a keyboard, abutton, or a switch, and receives an operation or an informationinputted from a user. The display device 1210 includes a screen (such asa liquid crystal display (LCD) and an organic light-emitting diode(OLED) display), and displays an output image of the smartphone 1200.The speaker 1211 converts audio signals that are outputted from thesmartphone 1200 to sounds.

The wireless communication interface 1212 supports any cellularcommunication scheme (such as LET and LTE-Advanced), and performswireless communication. The wireless communication interface 1212 maytypically include, for example, a BB processor 1213 and an RF circuit1214. The BB processor 1213 may perform, for example, encoding/decoding,modulating/demodulating, and multiplexing/demultiplexing, and performsvarious types of signal processing for wireless communication.Meanwhile, the RF circuit 1214 may include, for example, a mixer, afilter, and an amplifier, and transmits and receives wireless signalsvia the antenna 1216. The wireless communication interface 1212 may be achip module having the BB processor 1213 and the RF circuit 1214integrated thereon. The wireless communication interface 1212 mayinclude multiple BB processors 1213 and multiple RF circuits 1214, asillustrated in FIG. 12. Although FIG. 12 illustrates the example inwhich the wireless communication interface 1212 includes the multiple BBprocessors 1213 and the multiple RF circuits 1214, the wirelesscommunication interface 1212 may also include a single BB processor 1213or a single RF circuit 1214.

Furthermore, in addition to a cellular communication scheme, thewireless communication interface 1212 may support another type ofwireless communication scheme such as a short-distance wirelesscommunication scheme, a near field communication scheme, and a radiolocal area network (LAN) scheme. In that case, the wirelesscommunication interface 1212 may include the BB processor 1213 and theRF circuit 1214 for each wireless communication scheme.

Each of the antenna switches 1215 switches connection destinations ofthe antennas 1216 among multiple circuits (such as circuits fordifferent wireless communication schemes) included in the wirelesscommunication interface 1212.

Each of the antennas 1216 includes a single or multiple antenna elements(such as multiple antenna elements included in an MIMO antenna), and isused for the wireless communication interface 1212 to transmit andreceive wireless signals. The smartphone 1200 may include the multipleantennas 1216, as illustrated in FIG. 12. Although FIG. 12 illustratesthe example in which the smartphone 1200 includes the multiple antennas1216, the smartphone 1200 may also include a single antenna 1216.

Furthermore, the smartphone 1200 may include the antenna 1216 for eachwireless communication scheme. In that case, the antenna switches 1215may be omitted from the configuration of the smartphone 1200.

The bus 1217 connects the processor 1201, the memory 1202, the storage1203, the external connection interface 1204, the camera 1206, thesensor 1207, the microphone 1208, the input device 1209, the displaydevice 1210, the speaker 1211, the wireless communication interface1212, and the auxiliary controller 1219 to each other. The battery 1218supplies power to blocks of the smartphone 1200 illustrated in FIG. 12via feeder lines, which are partially shown as dashed lines in thedrawing. The auxiliary controller 1219 operates a minimum necessaryfunction of the smartphone 1200, for example, in a sleep mode.

In the smartphone 1200 illustrated in FIG. 12, the communication unit720 described by using FIG. 7 may be implemented by the wirelesscommunication interface 1212. At least a part of the functions may alsobe implemented by the processor 1201 or the auxiliary controller 1219.

FIG. 13 is a block diagram illustrating an example of a schematicconfiguration of a car navigation device 1320 to which the technologyaccording to the present disclosure is applicable. The car navigationdevice 1320 includes a processor 1321, a memory 1322, a globalpositioning system (GPS) module 1324, a sensor 1325, a data interface1326, a content player 1327, a storage medium interface 1328, an inputdevice 1329, a display device 1330, a speaker 1331, a wirelesscommunication interface 1333, one or more antenna switches 1336, one ormore antennas 1337, and a battery 1338.

The processor 1321 may be, for example, a CPU or a SoC, and controls anavigation function and another function of the car navigation device1320. The memory 1322 includes RAM and ROM, and stores a program that isexecuted by the processor 1321, and data.

The GPS module 1324 uses GPS signals received from a GPS satellite tomeasure a position (such as latitude, longitude, and altitude) of thecar navigation device 1320. The sensor 1325 may include a group ofsensors such as a gyro sensor, a geomagnetic sensor, and an air pressuresensor. The data interface 1326 is connected to, for example, anin-vehicle network 1341 via a terminal that is not shown, and acquiresdata generated by the vehicle, such as vehicle speed data.

The content player 1327 reproduces content stored in a storage medium(such as a CD and a DVD) that is inserted into the storage mediuminterface 1328. The input device 1329 includes, for example, a touchsensor configured to detect touch on a screen of the display device1330, a button, or a switch, and receives an operation or an informationinputted from a user. The display device 1330 includes a screen such asa LCD or an OLED display, and displays an image of the navigationfunction or content that is reproduced. The speaker 1331 outputs soundsof the navigation function or the content that is reproduced.

The wireless communication interface 1333 supports any cellularcommunication scheme (such as LTE and LTE-Advanced), and performswireless communication. The wireless communication interface 1333 maytypically include, for example, a BB processor 1334 and an RF circuit1335. The BB processor 1334 may perform, for example, encoding/decoding,modulating/demodulating, and multiplexing/demultiplexing, and performsvarious types of signal processing for wireless communication.Meanwhile, the RF circuit 1335 may include, for example, a mixer, afilter, and an amplifier, and transmits and receives wireless signalsvia the antenna 1337. The wireless communication interface 1333 may alsobe one chip module that has the BB processor 1334 and the RF circuit1335 integrated thereon. The wireless communication interface 1333 mayinclude multiple BB processors 1334 and multiple RF circuits 1335, asillustrated in FIG. 13. Although FIG. 13 illustrates the example inwhich the wireless communication interface 1333 includes the multiple BBprocessors 1334 and the multiple RF circuits 1335, the wirelesscommunication interface 1333 may also include a single BB processor 1334or a single RF circuit 1335.

Furthermore, in addition to a cellular communication scheme, thewireless communication interface 1333 may support another type ofwireless communication scheme such as a short-distance wirelesscommunication scheme, a near field communication scheme, and a wirelessLAN scheme. In that case, the wireless communication interface 1333 mayinclude the BB processor 1334 and the RF circuit 1335 for each wirelesscommunication scheme.

Each of the antenna switches 1336 switches connection destinations ofthe antennas 1337 among multiple circuits (such as circuits fordifferent wireless communication schemes) included in the wirelesscommunication interface 1333.

Each of the antennas 1337 includes a single or multiple antenna elements(such as multiple antenna elements included in an MIMO antenna), and isused for the wireless communication interface 1333 to transmit andreceive wireless signals. The car navigation device 1320 may includemultiple antennas 1337, as illustrated in FIG. 13. Although FIG. 13illustrates the example in which the car navigation device 1320 includesthe multiple antennas 1337, the car navigation device 1320 may alsoinclude a single antenna 1337.

Furthermore, the car navigation device 1320 may include the antenna 1337for each wireless communication scheme. In that case, the antennaswitches 1336 may be omitted from the configuration of the carnavigation device 1320.

The battery 1338 supplies power to blocks of the car navigation device1320 illustrated in FIG. 13 via feeder lines that are partially shown asdashed lines in the drawing. The battery 1338 accumulates power suppliedform the vehicle.

In the car navigation device 1320 illustrated in FIG. 13, thecommunication unit 720 described by using FIG. 7 may be implemented bythe wireless communication interface 1333. At least a part of thefunctions may also be implemented by the processor 1321.

The technology of the present disclosure may also be realized as anin-vehicle system (or a vehicle) 1340 including one or more blocks ofthe car navigation device 1320, the in-vehicle network 1341, and avehicle module 1342. The vehicle module 1342 generates vehicle data(such as vehicle speed, engine speed, and trouble information), andoutputs the generated data to the in-vehicle network 1341.

In the system and method of the present disclosure, it will be apparentthat the components or steps may be decomposed and/or recombined. Thesedecomposition and/or recombination shall be considered as equivalent tothe present disclosure. Also, the steps of executing the above-describedseries of processes can be naturally performed in chronological order inthe described order, but need not necessarily be performed inchronological order. Some steps may be performed in parallel orindependently from each other.

While the embodiments of the present disclosure have been described indetail with reference to the accompanying drawings, it is to beunderstood that the above-described embodiments are merely illustrativeof the present disclosure and are not to be construed as limiting thepresent disclosure. It will be apparent to those skilled in the art thatvarious modifications and variations can be made in the above-describedembodiments without departing from the spirit and scope of the presentdisclosure. Accordingly, the scope of the disclosure is to be limitedonly by the appended claims and their equivalents.

The invention claimed is:
 1. An electronic device in a wirelesscommunication system, comprising: one or more processing circuitsconfigured to execute operations of: determining a correspondingtransceiver unit TXRU configuration based on an antenna arraycorresponding to the electronic device, wherein each TXRU is related toa group of antenna units having a same polarization direction, theantenna array comprises a plurality of antenna units which are in M rowsand N columns and have a P-dimension polarization direction, wherein M,N and P are natural numbers; adding antenna configuration informationinto a Radio Resource Control RRC signaling for a user equipment in thewireless communication system, wherein the user equipment is configuredto use the antenna configuration information to obtain the number ofTXRUs in the antenna array; and receiving from the user equipmentfeedback information determined, at least n part, using the number ofTXRUs in the antenna array.
 2. The electronic device according to claim1, wherein the antenna configuration information is used to obtain atleast information on a parameter M_(TXRU) to indicate the number ofTXRUs in each dimension of a polarization direction of each column inthe antenna array.
 3. The electronic device according to claim 2,wherein a numerical range of the parameter M_(TXRU) at least comprises1, 2, 4 and 8 and a value of the para M_(TXRU) is less than or equal toa value of a parameter M.
 4. The electronic device according to claim 2,wherein the antenna configuration information explicitly containsinformation on an antenna configuration parameter, and the antennaconfiguration parameter comprises one or more of: the parameterM_(TXRU), a parameter M, a parameter N, a parameter P and a combinationthereof.
 5. The electronic device according to claim 4, wherein theprocessing circuit adds the antenna configuration information into anantenna notification information unit or a Channel State InformationReference Signal CSI-RS configuration information unit in the RRCsignaling.
 6. The electronic device according to claim 2, wherein theantenna configuration information implicitly contains information on anantenna configuration parameter and the processing circuit adds theantenna configuration information by using a codebook subset restrictionin the RRC signaling.
 7. The electronic device according to claim 6,wherein the processing circuit expresses the configuration informationby adding a predetermined bit number into a bit string for selecting acodebook in the codebook subset restriction.
 8. The electronic deviceaccording to claim 6, wherein the processing circuit expresses theantenna configuration information by adding a codebook index into thecodebook subset restriction.
 9. The electronic device according to claim1, wherein the RRC signaling contains information on the number ofantenna ports usable for a 3-Dimension Multiple-Input Multiple-Output 3DMIMO/Full-Dimension Multiple-Input Multiple-Output FD MIMO system toindicate the number of the TXRUs.
 10. The electronic device according toclaim 1, wherein the wireless communication system a Long TermEvolution-Advanced LTE-A cellular communication system, the electronicdevice is a base station in the wireless communication system, and theelectronic device further comprises the antenna array.
 11. An electronicdevice in a wireless communication system, comprising: one or moreprocessing circuits configured to execute an operation of: extractingantenna configuration information from an RRC signaling from a basestation in the wireless communication system, wherein the antennaconfiguration information is used to obtain the number of transceiverunits TXRUs in an antenna array of the base station, wherein each TXRUis related to a group of antenna units having a same polarizationdirection, the antenna array comprises a plurality of antenna unitswhich are in M rows and N columns and have a P-dimension polarizationdirection, wherein M, N and P are natural numbers, and sending feedbackinformation to the base station, wherein the feedback information isdetermined at least in part, using the number of TXRUs in the antennaarray.
 12. The electronic device according to claim 11, wherein theantenna configuration information is used to obtain at least informationon a parameter M_(TXRU) to indicate the number of TXRUs in eachdimension of a polarization direction of each column in the antennaarray.
 13. The electronic device according to claim 12, wherein anumerical range of the parameter M_(TXRU) at least comprises 1, 2, 4 and8 and a value of the parameter M_(TXRU) is less than or equal to a valueof a parameter M.
 14. The electronic device according to claim 12,wherein the antenna configuration parameter comprises the parameterMTXRLT, a parameter M, a parameter N and a parameter P.
 15. Theelectronic device according to claim 12, wherein the processing circuitis configured to decode at least one of an antenna notificationinformation unit, a Channel State Information Reference Signal CSI-RSconfiguration information unit and a codebook subset restrictioninformation unit in the RRC signaling to obtain the antennaconfiguration information.
 16. The electronic device according to claim11, wherein the processing circuit further extracts, from the RRCsignaling, information on the number of antenna ports usable for a3-Dimension Multiple-Input Multiple-Output 3D MIMO/Full-DimensionMultiple-Input Multiple-Output FD MEMO system to determine the number ofthe TXRUs.
 17. The electronic device according to claim 11, wherein theprocessing circuit selects at least one of a Channel State InformationCSI feedback codebook and a CSI feedback scheme based on the antennaconfiguration information.
 18. A method for performing wirelesscommunication in a wireless communication system, comprising:determining a corresponding transceiver unit TXRU configuration based onan antenna array corresponding to an electronic device in the wirelesscommunication system, wherein each TXRU is related to a group of antennaunits having a same polarization direction, the antenna array comprisesa plurality of antenna units which are in M rows and N columns and havea P-dimension polarization direction, wherein M, N and P are naturalnumbers; adding antenna configuration information into a Radio ResourceControl RRC signaling for a user equipment in the wireless communicationsystem, wherein the user equipment is configured to use the antennaconfiguration information to obtain the number of TXRUs in the antennaarray; and receiving from the user equipment feedback informationdetermined at least in part, using the number of TXRUs in the antennaarray.
 19. A method for performing wireless communication in a wirelesscommunication system, comprising: extracting antenna configurationinformation from an RRC signaling from a base station in the wirelesscommunication system, wherein the antenna configuration information isused to obtain the number of transceiver units TXRUs in an antenna arrayof the base station, wherein each TXRU is related to a group of antennaunits having a same polarization direction, the antenna array comprisesa plurality of antenna units which are in M rows and N columns and havea P-dimension polarization direction, wherein M, N and P are naturalnumbers, sending feedback information to the base station, wherein thefeedback information is determined, at least in part, using the numberof TXRUs in the antenna array.